<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h3 style="color: #2aabd2">课程列表</h3>
<ol>
    <li>css</li>
    <li>html</li>
    <li>js</li>
    <li>h4</li>
    <li>h5</li>
</ol>
</body>
</html>